Here is something I read on another forum:
“Just talked to my dad who was a A320 pilot for a long time. He said if they did lose both engines the controls go into a “reduced” mode and things are not as responsive. He said roll control (ailerons) would not be too bad so he could keep the wings level. However the pitch (elevators) become sluggish where it would be very easy to over control. Also, he would have had a tailwind so he would have been going well over 150 knots. Given all of that my dad figured he did one hell of a job.”
So what is emergency backup for the fly by wire controls?